Having some problems seeing this - first turn of 1914 Austria Hungary has 83 PP (counting the numbers on the cities when holding the space bar - but I only see an income of 63 on the managment tab - what am I not seeing

As you recruit and reinforce units, your national manpower reserves drop. Income is reduced proportionally to that, so if you've reduced your manpower pool by 20%, your income follows. In the management tab, this is shown in the column where the icon looks like two men and a % sign.

The CP in the first few turns of the war are affected by War Effort. At the end of each turn, you should see (in your turn report) 'War effort increased to 80%' or something like that. During these early turns, the CP only get a percentage of their total income. It quickly ramps up to 100%.

On cities? They mean that the total provided is lowered. This is usually due to attacks on the city or it being recently captured. In time the numbers will come back up to full value (or half of value if a conquered city).